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Solid polycarboxylate-type slump retaining agent and preparation method thereof

A technology of polycarboxylic acid series and slump retaining agent is applied in the field of preparation of solid polycarboxylic acid series slump retaining agent and solid slump retaining agent. Poison, low cost of transportation effect

Inactive Publication Date: 2017-06-13
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods have defects of high temperature or complex process

Method used

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  • Solid polycarboxylate-type slump retaining agent and preparation method thereof
  • Solid polycarboxylate-type slump retaining agent and preparation method thereof
  • Solid polycarboxylate-type slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 112.4 parts of ditrimethylolpropane to the reaction kettle equipped with a thermometer, a stirring blade, a constant flow pump, a condenser and a water separator, and raise the temperature to 70°C under stirring until the bottom material is completely melted; 108.0 parts of horse Add anhydride slowly in 3 to 4 times, with an interval of 10 minutes between each time. After the addition, add 2.0 parts of p-toluenesulfonic acid at one time, then raise the temperature to 95°C-100°C, keep the reaction for 4.5 hours, and cool down to 60°C-70°C. ℃; add 712 parts of isopentenol polyoxyethylene ether (the average added mole number of ethylene oxide is 54), stir and melt, then add 4.7 parts of benzoyl peroxide and stir to dissolve; then add 4.7 parts of sodium persulfate, 7.7 1 part of octyl thioglycolate and 42.5 parts of acrylic acid to make a mixed solution, and use a constant current pump to drip it within 3.5 hours to 4 hours; after dropping, continue to keep warm for 2 h...

Embodiment 2

[0031] Add 105.0 parts of ditrimethylolpropane to a reaction kettle equipped with a thermometer, a stirring blade, a constant flow pump, a condenser and a water separator, and raise the temperature to 70°C under stirring until the bottom material is completely melted; 122.3 parts of horse Add the acid anhydride slowly in 3 to 4 times, with an interval of 10 minutes between each time. After the addition, add 1.2 parts of p-toluenesulfonic acid at one time, then raise the temperature to 105 ° C ~ 110 ° C, keep the reaction for 3 hours to 4 hours, and cool down to 60 ℃~70℃; add 652 parts of isopentenol polyoxyethylene ether (the average added mole number of ethylene oxide is 36), stir and melt, then add 4.9 parts of azobisisoheptanonitrile and stir to dissolve; then add 4.9 parts of Ammonium sulfate, 9.8 parts of butanethiol and 85.5 parts of methacrylic acid are formulated into a mixed solution, and are dripped with a constant current pump within 2.5 hours to 3 hours; after the d...

Embodiment 3

[0033]Add 162.8 parts of ditrimethylolpropane to the reaction kettle equipped with thermometer, stirring paddle, constant flow pump, condenser and water separator, and heat up to 70°C under stirring until the bottom material is completely melted; 220.8 parts of horse Add acid anhydride slowly in 3 to 4 times, with an interval of 10 minutes each time. After the addition, add 2.7 parts of sulfamic acid at one time, then raise the temperature to 95°C to 100°C, keep the temperature for 2.5 hours to 3 hours, and then cool down to 60°C ~70°C; add 495 parts of isopentenol polyoxyethylene ether (the average added mole number of ethylene oxide is 27), stir and melt, then add 6.6 parts of benzoyl peroxide and stir to dissolve; then add 2.9 parts of sodium persulfate , 7.8 parts of octyl 3-mercaptopropionate and 87.5 parts of methacrylic acid to make a mixed solution, and drop it with a constant flow pump within 3 hours; after dropping, continue to keep warm for 3.5 hours to 4 hours, add ...

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Abstract

The invention discloses a solid polycarboxylate-type slump retaining agent and a preparation method thereof. The preparation method of the slump retaining agent comprises the steps that maleic anhydride and di-trimethylolpropane are prepared into ester monomers under the action of a catalyst, then the ester monomers, TPEG and crylic acid are subjected to pure copolymerization under the action of a composite initiator and a hydrophobic chain transfer agent, and a molten state polycarboxylate-type slump retaining agent is obtained; finally, the polycarboxylate-type slump retaining agent is fed to a condensation slicer through a heat preservation pipeline for slicing, and the white flaky solid polycarboxylate-type slump retaining agent is obtained. The acid-ester ratio of a polycarboxylate-type water reducing agent is adjusted, the self-prepared ester monomers are introduced, and by means of the combination of an oil-soluble composite initiator and a water-soluble composite initiator, the solid polycarboxylate-type slump retaining agent is prepared in a molten state. The slump retaining agent can still show good fluidity keeping capacity at a low mixing amount and is stable in state and safe and environmentally friendly in preparation process, and meanwhile the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a solid polycarboxylate-based slump-retaining agent and a preparation method of the solid slump-retaining agent. Background technique [0002] With the rise of my country's nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure, especially the large-scale implementation of the national railway passenger dedicated line network project, the market demand for polycarboxylate water reducers continues to grow. Compared with traditional high-efficiency water reducers, polycarboxylate water reducers have become the key materials for high-performance concrete due to their excellent properties such as high water reducing rate, low slump loss, and low alkali content. [0003] Most of the polycarboxylate water reducers on the market are 10% to 50% liquid products. Due to their superior performance, they are incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/14C08F222/16C04B24/26C04B103/30
CPCC04B24/2605C04B24/267C04B24/2694C04B2103/308C08F283/065C08F222/103
Inventor 陈国新祝烨然杜志芹孙国荣唐修生温金保曹伟张晓芳付丹华华静雨
Owner NANJING HYDRAULIC RES INST
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